Hummer H2. Manual — part 2057
Inflatable Restraint Sensing and Diagnostic Module (SDM) Terminal Identification
Connector Part Information
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12186989
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2-Way M Metri-Pack 280 Pull To Seat (YE)
Pin
Wire Color
Circuit No.
Function
A
WH/BK
1403
I/P Module - High Control
B
D-GN/
WH
1404
I/P Module - Low Control
2004 Hummer H2
2004 RESTRAINTS SIR - Hummer H2
Inflatable Restraint Steering Wheel Module Terminal Identification
Connector Part Information
z
15356922
z
42-Way F Micro-Pack 100 W (YE)
Pin
Wire Color
Circuit No.
Function
1
YE
1139
Ignition 1 Voltage
2
TN/BK
371
I/P Module Disable Switch - Signal
3
BK/WH
238
Seat Belt Switch - Left
4
PK
353
I/P Module Suppression Indicator Control
5
GY
349
Discriminating Sensor - Left - Signal
6
WH/BK
2611
Discriminating Sensor - Right - Signal
7-8
-
-
Not Used
9
WH/BK
1403
I/P Module - High Control
10
D-GN/
WH
1404
I/P Module - Low Control
11
D-BU
1363
Seat Belt Switch - Left-Low Reference
12
D-GN
348
Steering Wheel Module - Low Control
13
WH
347
Steering Wheel Module - High Control
14-21
-
-
Not Used
22
D-BU
1128
SDM Class 2 Serial Data
23-25
-
-
Not Used
26
YE
354
Discriminating Sensor - Left-Low Reference
27
PU
2612
Discriminating Sensor - Right-Low Reference
28-31
-
-
Not Used
32
BK
2351
Ground
33-42
-
-
Not Used
2004 Hummer H2
2004 RESTRAINTS SIR - Hummer H2
DIAGNOSTIC INFORMATION AND PROCEDURES
DIAGNOSTIC STARTING POINT - SIR
Begin the system diagnosis with Diagnostic System Check - SIR . The Diagnostic System Check - SIR will
provide the following information:
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The identification of the control module(s) which commands the system.
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The ability of the control module(s) to communicate through the serial data circuit.
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The identification of any stored diagnostic trouble codes (DTCs) and their status.
The use of Diagnostic System Check - SIR will identify the correct procedure for diagnosing the system and
where the procedure is located.
DIAGNOSTIC SYSTEM CHECK - SIR
These diagnostic procedures will help you to find and repair SIR system malfunctions. This service category
Connector Part Information
z
54560210
z
2-Way F Framatone ABX-3 Code C (YE)
Pin
Wire Color
Circuit No.
Function
A
WH
347
Steering Wheel Module - High Control
B
D-GN
348
Steering Wheel Module - Low Control
CAUTION: Refer to SIR Special Tool Caution in Cautions and Notices.
2004 Hummer H2
2004 RESTRAINTS SIR - Hummer H2
also contains information for repairing SIR system malfunctions. For best results, use the diagnostic tables, and
follow the sequence listed below:
1. Perform the Diagnostic System Check - SIR. All SIR diagnostics must begin with the A Diagnostic
System Check - SIR. The Diagnostic System Check - SIR determines the following results:
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Proper AIR BAG warning lamp operation
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Ability of the SDM to communicate through the data link connector (DLC)
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Existence of SIR current and/or history diagnostic trouble codes (DTC)
2. Refer to the diagnostic table as directed by the A Diagnostic System Check - SIR. The diagnostic tables
will help enable you to diagnose any SIR system malfunction. Bypassing these procedures may result in
the following problems:
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Extended diagnostic time
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Incorrect diagnosis
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Incorrect parts replacement
3. Repeat the Diagnostic System Check - SIR after you perform any repairs or diagnostic procedures. This
will verify that you correctly performed the repair. This will also ensure that no other malfunctions exist.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
1: This step checks to see if the AIR BAG warning lamp flashes seven times and then turns off when the
ignition key is turned ON.
2: This step checks to see if the scan tool powers up.
3: This step checks to see if the scan tool can communicate with the inflatable restraint sensing and
diagnostic module (SDM).
4: This step checks to see if there are any current or history diagnostic trouble codes (DTCs) present.
5: This step checks to see if there are communication DTCs (U-codes) present.
6: This step checks to see if DTC B1000 (ECU Malfunction) is present.
Diagnostic System Check - SIR
Step
Action
Yes
No
1
1. Note the AIR BAG
warning lamp while
turning the ignition switch
ON.
2. The AIR BAG warning
lamp should turn OFF after
flashing seven times.
Does the AIR BAG warning
lamp flash seven times and then
turn off?
Go to Step 2
Go to Symptoms - SIR
2004 Hummer H2
2004 RESTRAINTS SIR - Hummer H2
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